不同造型风格的车身低阻基本形体  

Low drag base bodies of different stylings

作　　者：韦甘[1] 杨志刚[1] 李启良[1] 

机构地区：[1]同济大学上海地面交通工具风洞中心,上海201804

出　　处：《计算机辅助工程》2014年第3期1-5,共5页Computer Aided Engineering

基　　金：国家重点基础研究发展计划("九七三"计划)(2011CB711203)

摘　　要：针对低阻车身造型风格多元化的需求,结合数值模拟和遗传算法,考虑不同的约束条件,求解4种造型风格不同且气动阻力因数在0.087~0.100内的车身低阻基本形体,并用缩比模型的风洞试验验证该方法的可靠性.高尾车型低阻基本形体的气动阻力因数值比低尾车型的偏高约0.010;不同长高比车身的气动阻力因数变化趋势不同,应独立进行优化.凹形头部与凸形头部的低阻基本形体都有低且长的尾部,头部正压区总面积相近.As to the diversification requirements of low drag automobile body styling, combiniug numerical simulation with genetic algorithm and considering different constraint conditions, the low drag base hodies in four different styles are calculated, of which the aerodynamic drag factors are at the range of 0. 087 -0. 100. The reliability of the method is validated by the results of scaled model test in wind tunnel. The aerodynamic drag factor of low drag base body in high-rear style is about 0. OlO higher than that of low drag base body in low-rear style. The changing trend of aerodynamic performance is different for the bodies with dift^rent length-height ratio, therefore they should be optimized respectively. The low drag base bodies with concave-head or convex-head type have long and low rear and the total positive pressure areas on the head are similar.

关 键 词：汽车 车身造型 气动优化 气动阻力因数 风洞试验 遗传算法 长高比 约束条件 

分 类 号：U461.1[机械工程—车辆工程] U462[交通运输工程—载运工具运用工程]